feat: 重构角色和子弹系统，添加伤害标签和Boss状态条

scripts/Statemachine/DamageLabel.gd

@@ -0,0 +1,18 @@
+extends Node2D
+class_name DamageLabel
+
+@export var damage: float = 0
+@export var crit: bool = false
+func _ready():
+	$"%label".text = str(round(damage)) + ("!!!" if crit else "")
+	$"%animator".play("show")
+	await $"%animator".animation_finished
+
+static func create(spawnDamage: float, spawnCrit: bool, spawnPosition: Vector2, addToWorld: bool = true) -> DamageLabel:
+	var instance = preload("res://components/UI/DamageLabel.tscn").instantiate()
+	instance.damage = spawnDamage
+	instance.crit = spawnCrit
+	instance.position = spawnPosition
+	if addToWorld:
+		WorldTool.rootNode.add_child(instance)
+	return instance